Bob Bowman, the longtime coach of swimming superstar Michael Phelps, has apologized for his role in "inappropriate" text messages sent in 2011 to a former Olympic swimmer Caroline Burckle.

Caroline Burckle (left). (Reuters)

Irvine: Bob Bowman, the longtime coach of swimming superstar Michael Phelps, has apologized for his role in "inappropriate" text messages sent in 2011 to a former Olympic swimmer Caroline Burckle.

The Orange County Register last week reported Burckle's allegation that she received "aggressive" sexually graphic text messages and a voicemail from a phone belonging to Bowman in May of 2011, the year after she retired from the sport.

Burckle, 32, told the newspaper the messages were sent by Bowman and Sean Hutchison.

Hutchison is the coach accused by former Olympian Ariana Kukors of sexually abusing her when she was a minor, although he has said they had a consensual relationship only after she became an adult.

"I regret the exercise of poor judgment in being involved one evening seven years ago with inappropriate communications," Bowman said in a statement this week. "I promptly apologized to the person to whom the communications were sent, and my apology was accepted.

"I have nothing further to say at this time."

According to the Register, USA Swimming's then national team director Frank Busch wrote to Bowman in 2011 pointing out "the severity of this situation" and saying the messages caused Burckle "significant mental distress".

However, Bowman, best known as the coach who guided Phelps to 23 Olympic gold medals, was named to the coaching staff for the 2012 Olympic team and served as head coach of the US men's swimming team at the 2016 Rio Games.

That's a decision that current USA Swimming chief executive Tim Hinchey said he didn't think would be made today.

"Certainly from hindsight, I don't think that's how I would have handled the situation quite frankly," Hinchey told reporters at the US national championships in Irvine -- where Bowman was coaching the Arizona State University team.

"Regardless of age, gender, athlete, non-athlete, no one deserves to have communications like that.

"If this happened today with one of our coaches, I can't see appointing him to an Olympic team," added Hinchey, although he did not specifically say that Bowman would no longer be considered for national team duties.

Hinchey testified before US Congress in May, acknowledging past abuse suffered by "children, athletes and other participants" in swimming programs.

He reiterated to reporters at the US national championships in Irvine, California, on Wednesday that USA Swimming has a "zero tolerance" policy for sexual abuse and sexual harrassment in the organization.

"Every day I think about it, every day it matters to me," he said of an issue that has roiled a range of sports and seen former USA Gymnastics team doctor Larry Nassar imprisoned for life for abusing hundreds of young girls and women under the guise of medical treatment.

"We need to listen to a lot of people," Hinchey said of efforts to change the culture in USA Swimming that allowed abuses.

"We've formed a working group from our board and athletes ... We're going to listen to as many people as we possibly can to make sure we get this right."

Hinchey confirmed that Hutchison, who is being sued by Kukors along with USA Swimming and former national team director Mark Schubert, is no longer a member of USA Swimming.